package cn.com.lc.Check;

public class Calculator {

    @Cheak
    public void add(){
        String str=null;
        str.toString();
        System.out.println("1 + 0 ="+(1+0));
    }

    @Cheak
    public void sub(){
        System.out.println("1 - 0 ="+(1-0));
    }

    @Cheak
    public void mul(){
        System.out.println("1 * 0 ="+(1*0));
    }

    @Cheak
    public void div(){
        System.out.println("1 / 0 ="+(1/0));
    }

    public void show(){
        System.out.println("永无Bug......");
    }
}
